media: staging/intel-ipu3: Add v4l2 driver based on media framework

Implement video driver that utilizes v4l2, vb2 queue support
and media controller APIs. The driver exposes single subdevice and
six nodes.
Signed-off-by: Yong Zhi <yong.zhi@intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/staging/media/ipu3/ipu3-v4l2.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Intel Corporation
+
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+
+#include <media/v4l2-ioctl.h>
+
+#include "ipu3.h"
+#include "ipu3-dmamap.h"
+
+/******************** v4l2_subdev_ops ********************/
+
+static int ipu3_subdev_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+	struct v4l2_rect try_crop = {
+		.top = 0,
+		.left = 0,
+		.width = 1920,
+		.height = 1080,
+	};
+	unsigned int i;
+
+	/* Initialize try_fmt */
+	for (i = 0; i < IMGU_NODE_NUM; i++) {
+		struct v4l2_mbus_framefmt *try_fmt =
+			v4l2_subdev_get_try_format(sd, fh->pad, i);
+
+		try_fmt->width = try_crop.width;
+		try_fmt->height = try_crop.height;
+		try_fmt->code = MEDIA_BUS_FMT_FIXED;
+		try_fmt->colorspace = V4L2_COLORSPACE_RAW;
+		try_fmt->field = V4L2_FIELD_NONE;
+	}
+
+	*v4l2_subdev_get_try_crop(sd, fh->pad, IMGU_NODE_IN) = try_crop;
+	*v4l2_subdev_get_try_compose(sd, fh->pad, IMGU_NODE_IN) = try_crop;
+
+	return 0;
+}
+
+static int ipu3_subdev_s_stream(struct v4l2_subdev *sd, int enable)
+{
+	struct imgu_device *imgu = container_of(sd, struct imgu_device, subdev);
+	int r = 0;
+
+	r = imgu_s_stream(imgu, enable);
+	if (!r)
+		imgu->streaming = enable;
+
+	return r;
+}
+
+static int ipu3_subdev_get_fmt(struct v4l2_subdev *sd,
+			       struct v4l2_subdev_pad_config *cfg,
+			       struct v4l2_subdev_format *fmt)
+{
+	struct imgu_device *imgu = container_of(sd, struct imgu_device, subdev);
+	struct v4l2_mbus_framefmt *mf;
+	u32 pad = fmt->pad;
+
+	if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
+		fmt->format = imgu->nodes[pad].pad_fmt;
+	} else {
+		mf = v4l2_subdev_get_try_format(sd, cfg, pad);
+		fmt->format = *mf;
+	}
+
+	return 0;
+}
+
+static int ipu3_subdev_set_fmt(struct v4l2_subdev *sd,
+			       struct v4l2_subdev_pad_config *cfg,
+			       struct v4l2_subdev_format *fmt)
+{
+	struct imgu_device *imgu = container_of(sd, struct imgu_device, subdev);
+	struct v4l2_mbus_framefmt *mf;
+	u32 pad = fmt->pad;
+
+	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY)
+		mf = v4l2_subdev_get_try_format(sd, cfg, pad);
+	else
+		mf = &imgu->nodes[pad].pad_fmt;
+
+	fmt->format.code = mf->code;
+	/* Clamp the w and h based on the hardware capabilities */
+	if (imgu->subdev_pads[pad].flags & MEDIA_PAD_FL_SOURCE) {
+		fmt->format.width = clamp(fmt->format.width,
+					  IPU3_OUTPUT_MIN_WIDTH,
+					  IPU3_OUTPUT_MAX_WIDTH);
+		fmt->format.height = clamp(fmt->format.height,
+					   IPU3_OUTPUT_MIN_HEIGHT,
+					   IPU3_OUTPUT_MAX_HEIGHT);
+	} else {
+		fmt->format.width = clamp(fmt->format.width,
+					  IPU3_INPUT_MIN_WIDTH,
+					  IPU3_INPUT_MAX_WIDTH);
+		fmt->format.height = clamp(fmt->format.height,
+					   IPU3_INPUT_MIN_HEIGHT,
+					   IPU3_INPUT_MAX_HEIGHT);
+	}
+
+	*mf = fmt->format;
+
+	return 0;
+}
+
+static int ipu3_subdev_get_selection(struct v4l2_subdev *sd,
+				     struct v4l2_subdev_pad_config *cfg,
+				     struct v4l2_subdev_selection *sel)
+{
+	struct imgu_device *imgu = container_of(sd, struct imgu_device, subdev);
+	struct v4l2_rect *try_sel, *r;
+
+	if (sel->pad != IMGU_NODE_IN)
+		return -EINVAL;
+
+	switch (sel->target) {
+	case V4L2_SEL_TGT_CROP:
+		try_sel = v4l2_subdev_get_try_crop(sd, cfg, sel->pad);
+		r = &imgu->rect.eff;
+		break;
+	case V4L2_SEL_TGT_COMPOSE:
+		try_sel = v4l2_subdev_get_try_compose(sd, cfg, sel->pad);
+		r = &imgu->rect.bds;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (sel->which == V4L2_SUBDEV_FORMAT_TRY)
+		sel->r = *try_sel;
+	else
+		sel->r = *r;
+
+	return 0;
+}
+
+static int ipu3_subdev_set_selection(struct v4l2_subdev *sd,
+				     struct v4l2_subdev_pad_config *cfg,
+				     struct v4l2_subdev_selection *sel)
+{
+	struct imgu_device *imgu = container_of(sd, struct imgu_device, subdev);
+	struct v4l2_rect *rect, *try_sel;
+
+	if (sel->pad != IMGU_NODE_IN)
+		return -EINVAL;
+
+	switch (sel->target) {
+	case V4L2_SEL_TGT_CROP:
+		try_sel = v4l2_subdev_get_try_crop(sd, cfg, sel->pad);
+		rect = &imgu->rect.eff;
+		break;
+	case V4L2_SEL_TGT_COMPOSE:
+		try_sel = v4l2_subdev_get_try_compose(sd, cfg, sel->pad);
+		rect = &imgu->rect.bds;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (sel->which == V4L2_SUBDEV_FORMAT_TRY)
+		*try_sel = sel->r;
+	else
+		*rect = sel->r;
+
+	return 0;
+}
+
+/******************** media_entity_operations ********************/
+
+static int ipu3_link_setup(struct media_entity *entity,
+			   const struct media_pad *local,
+			   const struct media_pad *remote, u32 flags)
+{
+	struct imgu_device *imgu = container_of(entity, struct imgu_device,
+						subdev.entity);
+	u32 pad = local->index;
+
+	WARN_ON(pad >= IMGU_NODE_NUM);
+
+	imgu->nodes[pad].enabled = flags & MEDIA_LNK_FL_ENABLED;
+
+	return 0;
+}
+
+/******************** vb2_ops ********************/
+
+static int ipu3_vb2_buf_init(struct vb2_buffer *vb)
+{
+	struct sg_table *sg = vb2_dma_sg_plane_desc(vb, 0);
+	struct imgu_device *imgu = vb2_get_drv_priv(vb->vb2_queue);
+	struct imgu_buffer *buf = container_of(vb,
+		struct imgu_buffer, vid_buf.vbb.vb2_buf);
+	struct imgu_video_device *node =
+		container_of(vb->vb2_queue, struct imgu_video_device, vbq);
+	unsigned int queue = imgu_node_to_queue(node - imgu->nodes);
+
+	if (queue == IPU3_CSS_QUEUE_PARAMS)
+		return 0;
+
+	return ipu3_dmamap_map_sg(imgu, sg->sgl, sg->nents, &buf->map);
+}
+
+/* Called when each buffer is freed */
+static void ipu3_vb2_buf_cleanup(struct vb2_buffer *vb)
+{
+	struct imgu_device *imgu = vb2_get_drv_priv(vb->vb2_queue);
+	struct imgu_buffer *buf = container_of(vb,
+		struct imgu_buffer, vid_buf.vbb.vb2_buf);
+	struct imgu_video_device *node =
+		container_of(vb->vb2_queue, struct imgu_video_device, vbq);
+	unsigned int queue = imgu_node_to_queue(node - imgu->nodes);
+
+	if (queue == IPU3_CSS_QUEUE_PARAMS)
+		return;
+
+	ipu3_dmamap_unmap(imgu, &buf->map);
+}
+
+/* Transfer buffer ownership to me */
+static void ipu3_vb2_buf_queue(struct vb2_buffer *vb)
+{
+	struct imgu_device *imgu = vb2_get_drv_priv(vb->vb2_queue);
+	struct imgu_video_device *node =
+		container_of(vb->vb2_queue, struct imgu_video_device, vbq);
+	unsigned int queue = imgu_node_to_queue(node - imgu->nodes);
+	unsigned long need_bytes;
+
+	if (vb->vb2_queue->type == V4L2_BUF_TYPE_META_CAPTURE ||
+	    vb->vb2_queue->type == V4L2_BUF_TYPE_META_OUTPUT)
+		need_bytes = node->vdev_fmt.fmt.meta.buffersize;
+	else
+		need_bytes = node->vdev_fmt.fmt.pix_mp.plane_fmt[0].sizeimage;
+
+	if (queue == IPU3_CSS_QUEUE_PARAMS) {
+		unsigned long payload = vb2_get_plane_payload(vb, 0);
+		struct vb2_v4l2_buffer *buf =
+			container_of(vb, struct vb2_v4l2_buffer, vb2_buf);
+		int r = -EINVAL;
+
+		if (payload == 0) {
+			payload = need_bytes;
+			vb2_set_plane_payload(vb, 0, payload);
+		}
+		if (payload >= need_bytes)
+			r = ipu3_css_set_parameters(&imgu->css,
+						    vb2_plane_vaddr(vb, 0));
+		buf->flags = V4L2_BUF_FLAG_DONE;
+		vb2_buffer_done(vb, r == 0 ? VB2_BUF_STATE_DONE
+					   : VB2_BUF_STATE_ERROR);
+
+	} else {
+		struct imgu_buffer *buf = container_of(vb, struct imgu_buffer,
+						       vid_buf.vbb.vb2_buf);
+
+		mutex_lock(&imgu->lock);
+		ipu3_css_buf_init(&buf->css_buf, queue, buf->map.daddr);
+		list_add_tail(&buf->vid_buf.list,
+			      &imgu->nodes[node - imgu->nodes].buffers);
+		mutex_unlock(&imgu->lock);
+
+		vb2_set_plane_payload(&buf->vid_buf.vbb.vb2_buf, 0, need_bytes);
+
+		if (imgu->streaming)
+			imgu_queue_buffers(imgu, false);
+	}
+}
+
+static int ipu3_vb2_queue_setup(struct vb2_queue *vq,
+				unsigned int *num_buffers,
+				unsigned int *num_planes,
+				unsigned int sizes[],
+				struct device *alloc_devs[])
+{
+	struct imgu_device *imgu = vb2_get_drv_priv(vq);
+	struct imgu_video_device *node =
+		container_of(vq, struct imgu_video_device, vbq);
+	const struct v4l2_format *fmt = &node->vdev_fmt;
+	unsigned int size;
+
+	*num_buffers = clamp_val(*num_buffers, 1, VB2_MAX_FRAME);
+	alloc_devs[0] = &imgu->pci_dev->dev;
+
+	if (vq->type == V4L2_BUF_TYPE_META_CAPTURE ||
+	    vq->type == V4L2_BUF_TYPE_META_OUTPUT)
+		size = fmt->fmt.meta.buffersize;
+	else
+		size = fmt->fmt.pix_mp.plane_fmt[0].sizeimage;
+
+	if (*num_planes) {
+		if (sizes[0] < size)
+			return -EINVAL;
+		size = sizes[0];
+	}
+
+	*num_planes = 1;
+	sizes[0] = size;
+	/* Initialize buffer queue */
+	INIT_LIST_HEAD(&node->buffers);
+
+	return 0;
+}
+
+/* Check if all enabled video nodes are streaming, exception ignored */
+static bool ipu3_all_nodes_streaming(struct imgu_device *imgu,
+				     struct imgu_video_device *except)
+{
+	unsigned int i;
+
+	for (i = 0; i < IMGU_NODE_NUM; i++) {
+		struct imgu_video_device *node = &imgu->nodes[i];
+
+		if (node == except)
+			continue;
+		if (node->enabled && !vb2_start_streaming_called(&node->vbq))
+			return false;
+	}
+
+	return true;
+}
+
+static void ipu3_return_all_buffers(struct imgu_device *imgu,
+				    struct imgu_video_device *node,
+				    enum vb2_buffer_state state)
+{
+	struct ipu3_vb2_buffer *b, *b0;
+
+	/* Return all buffers */
+	mutex_lock(&imgu->lock);
+	list_for_each_entry_safe(b, b0, &node->buffers, list) {
+		list_del(&b->list);
+		vb2_buffer_done(&b->vbb.vb2_buf, state);
+	}
+	mutex_unlock(&imgu->lock);
+}
+
+static int ipu3_vb2_start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+	struct imgu_device *imgu = vb2_get_drv_priv(vq);
+	struct imgu_video_device *node =
+		container_of(vq, struct imgu_video_device, vbq);
+	int r;
+
+	if (imgu->streaming) {
+		r = -EBUSY;
+		goto fail_return_bufs;
+	}
+
+	if (!node->enabled) {
+		r = -EINVAL;
+		goto fail_return_bufs;
+	}
+	r = media_pipeline_start(&node->vdev.entity, &imgu->pipeline);
+	if (r < 0)
+		goto fail_return_bufs;
+
+	if (!ipu3_all_nodes_streaming(imgu, node))
+		return 0;
+
+	/* Start streaming of the whole pipeline now */
+
+	r = v4l2_subdev_call(&imgu->subdev, video, s_stream, 1);
+	if (r < 0)
+		goto fail_stop_pipeline;
+
+	return 0;
+
+fail_stop_pipeline:
+	media_pipeline_stop(&node->vdev.entity);
+fail_return_bufs:
+	ipu3_return_all_buffers(imgu, node, VB2_BUF_STATE_QUEUED);
+
+	return r;
+}
+
+static void ipu3_vb2_stop_streaming(struct vb2_queue *vq)
+{
+	struct imgu_device *imgu = vb2_get_drv_priv(vq);
+	struct imgu_video_device *node =
+		container_of(vq, struct imgu_video_device, vbq);
+	int r;
+
+	WARN_ON(!node->enabled);
+
+	/* Was this the first node with streaming disabled? */
+	if (ipu3_all_nodes_streaming(imgu, node)) {
+		/* Yes, really stop streaming now */
+		r = v4l2_subdev_call(&imgu->subdev, video, s_stream, 0);
+		if (r)
+			dev_err(&imgu->pci_dev->dev,
+				"failed to stop streaming\n");
+	}
+
+	ipu3_return_all_buffers(imgu, node, VB2_BUF_STATE_ERROR);
+	media_pipeline_stop(&node->vdev.entity);
+}
+
+/******************** v4l2_ioctl_ops ********************/
+
+#define VID_CAPTURE	0
+#define VID_OUTPUT	1
+#define DEF_VID_CAPTURE	0
+#define DEF_VID_OUTPUT	1
+
+struct ipu3_fmt {
+	u32	fourcc;
+	u16	type; /* VID_CAPTURE or VID_OUTPUT not both */
+};
+
+/* format descriptions for capture and preview */
+static const struct ipu3_fmt formats[] = {
+	{ V4L2_PIX_FMT_NV12, VID_CAPTURE },
+	{ V4L2_PIX_FMT_IPU3_SGRBG10, VID_OUTPUT },
+	{ V4L2_PIX_FMT_IPU3_SBGGR10, VID_OUTPUT },
+	{ V4L2_PIX_FMT_IPU3_SGBRG10, VID_OUTPUT },
+	{ V4L2_PIX_FMT_IPU3_SRGGB10, VID_OUTPUT },
+};
+
+/* Find the first matched format, return default if not found */
+static const struct ipu3_fmt *find_format(struct v4l2_format *f, u32 type)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(formats); i++) {
+		if (formats[i].fourcc == f->fmt.pix_mp.pixelformat &&
+		    formats[i].type == type)
+			return &formats[i];
+	}
+
+	return type == VID_CAPTURE ? &formats[DEF_VID_CAPTURE] :
+				     &formats[DEF_VID_OUTPUT];
+}
+
+static int ipu3_vidioc_querycap(struct file *file, void *fh,
+				struct v4l2_capability *cap)
+{
+	struct imgu_video_device *node = file_to_intel_ipu3_node(file);
+
+	strscpy(cap->driver, IMGU_NAME, sizeof(cap->driver));
+	strscpy(cap->card, IMGU_NAME, sizeof(cap->card));
+	snprintf(cap->bus_info, sizeof(cap->bus_info), "PCI:%s", node->name);
+
+	return 0;
+}
+
+static int enum_fmts(struct v4l2_fmtdesc *f, u32 type)
+{
+	unsigned int i, j;
+
+	for (i = j = 0; i < ARRAY_SIZE(formats); ++i) {
+		if (formats[i].type == type) {
+			if (j == f->index)
+				break;
+			++j;
+		}
+	}
+
+	if (i < ARRAY_SIZE(formats)) {
+		f->pixelformat = formats[i].fourcc;
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
+				   struct v4l2_fmtdesc *f)
+{
+	if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
+		return -EINVAL;
+
+	return enum_fmts(f, VID_CAPTURE);
+}
+
+static int vidioc_enum_fmt_vid_out(struct file *file, void *priv,
+				   struct v4l2_fmtdesc *f)
+{
+	if (f->type != V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
+		return -EINVAL;
+
+	return enum_fmts(f, VID_OUTPUT);
+}
+
+/* Propagate forward always the format from the CIO2 subdev */
+static int ipu3_vidioc_g_fmt(struct file *file, void *fh,
+			     struct v4l2_format *f)
+{
+	struct imgu_video_device *node = file_to_intel_ipu3_node(file);
+
+	f->fmt = node->vdev_fmt.fmt;
+
+	return 0;
+}
+
+/*
+ * Set input/output format. Unless it is just a try, this also resets
+ * selections (ie. effective and BDS resolutions) to defaults.
+ */
+static int imgu_fmt(struct imgu_device *imgu, int node,
+		    struct v4l2_format *f, bool try)
+{
+	struct v4l2_pix_format_mplane try_fmts[IPU3_CSS_QUEUES];
+	struct v4l2_pix_format_mplane *fmts[IPU3_CSS_QUEUES] = { NULL };
+	struct v4l2_rect *rects[IPU3_CSS_RECTS] = { NULL };
+	struct v4l2_mbus_framefmt pad_fmt;
+	unsigned int i, css_q;
+	int r;
+
+	if (imgu->nodes[IMGU_NODE_PV].enabled &&
+	    imgu->nodes[IMGU_NODE_VF].enabled) {
+		dev_err(&imgu->pci_dev->dev,
+			"Postview and vf are not supported simultaneously\n");
+		return -EINVAL;
+	}
+	/*
+	 * Tell css that the vf q is used for PV
+	 */
+	if (imgu->nodes[IMGU_NODE_PV].enabled)
+		imgu->css.vf_output_en = IPU3_NODE_PV_ENABLED;
+	else if (imgu->nodes[IMGU_NODE_VF].enabled)
+		imgu->css.vf_output_en = IPU3_NODE_VF_ENABLED;
+
+	for (i = 0; i < IPU3_CSS_QUEUES; i++) {
+		unsigned int inode = imgu_map_node(imgu, i);
+
+		/* Skip the meta node */
+		if (inode == IMGU_NODE_STAT_3A || inode == IMGU_NODE_PARAMS)
+			continue;
+		/* imgu_map_node defauls to PV if VF not enabled */
+		if (inode == IMGU_NODE_PV && node == IMGU_NODE_VF &&
+		    imgu->css.vf_output_en == IPU3_NODE_VF_DISABLED)
+			inode = node;
+
+		if (try) {
+			try_fmts[i] = imgu->nodes[inode].vdev_fmt.fmt.pix_mp;
+			fmts[i] = &try_fmts[i];
+		} else {
+			fmts[i] = &imgu->nodes[inode].vdev_fmt.fmt.pix_mp;
+		}
+
+		/* CSS expects some format on OUT queue */
+		if (i != IPU3_CSS_QUEUE_OUT &&
+		    !imgu->nodes[inode].enabled && inode != node)
+			fmts[i] = NULL;
+	}
+
+	if (!try) {
+		/* eff and bds res got by imgu_s_sel */
+		rects[IPU3_CSS_RECT_EFFECTIVE] = &imgu->rect.eff;
+		rects[IPU3_CSS_RECT_BDS] = &imgu->rect.bds;
+		rects[IPU3_CSS_RECT_GDC] = &imgu->rect.gdc;
+
+		/* suppose that pad fmt was set by subdev s_fmt before */
+		pad_fmt = imgu->nodes[IMGU_NODE_IN].pad_fmt;
+		rects[IPU3_CSS_RECT_GDC]->width = pad_fmt.width;
+		rects[IPU3_CSS_RECT_GDC]->height = pad_fmt.height;
+	}
+
+	/*
+	 * imgu doesn't set the node to the value given by user
+	 * before we return success from this function, so set it here.
+	 */
+	css_q = imgu_node_to_queue(node);
+	if (fmts[css_q])
+		*fmts[css_q] = f->fmt.pix_mp;
+	else
+		return -EINVAL;
+
+	if (try)
+		r = ipu3_css_fmt_try(&imgu->css, fmts, rects);
+	else
+		r = ipu3_css_fmt_set(&imgu->css, fmts, rects);
+
+	/* r is the binary number in the firmware blob */
+	if (r < 0)
+		return r;
+
+	if (try)
+		f->fmt.pix_mp = *fmts[css_q];
+	else
+		f->fmt = imgu->nodes[node].vdev_fmt.fmt;
+
+	return 0;
+}
+
+static int ipu3_try_fmt(struct file *file, void *fh, struct v4l2_format *f)
+{
+	struct v4l2_pix_format_mplane *pixm = &f->fmt.pix_mp;
+	const struct ipu3_fmt *fmt;
+
+	if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
+		fmt = find_format(f, VID_CAPTURE);
+	else if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
+		fmt = find_format(f, VID_OUTPUT);
+	else
+		return -EINVAL;
+
+	pixm->pixelformat = fmt->fourcc;
+
+	memset(pixm->plane_fmt[0].reserved, 0,
+	       sizeof(pixm->plane_fmt[0].reserved));
+
+	return 0;
+}
+
+static int ipu3_vidioc_try_fmt(struct file *file, void *fh,
+			       struct v4l2_format *f)
+{
+	struct imgu_device *imgu = video_drvdata(file);
+	struct imgu_video_device *node = file_to_intel_ipu3_node(file);
+	int r;
+
+	r = ipu3_try_fmt(file, fh, f);
+	if (r)
+		return r;
+
+	return imgu_fmt(imgu, node - imgu->nodes, f, true);
+}
+
+static int ipu3_vidioc_s_fmt(struct file *file, void *fh, struct v4l2_format *f)
+{
+	struct imgu_device *imgu = video_drvdata(file);
+	struct imgu_video_device *node = file_to_intel_ipu3_node(file);
+	int r;
+
+	r = ipu3_try_fmt(file, fh, f);
+	if (r)
+		return r;
+
+	return imgu_fmt(imgu, node - imgu->nodes, f, false);
+}
+
+static int ipu3_meta_enum_format(struct file *file, void *fh,
+				 struct v4l2_fmtdesc *f)
+{
+	struct imgu_video_device *node = file_to_intel_ipu3_node(file);
+
+	/* Each node is dedicated to only one meta format */
+	if (f->index > 0 || f->type != node->vbq.type)
+		return -EINVAL;
+
+	f->pixelformat = node->vdev_fmt.fmt.meta.dataformat;
+
+	return 0;
+}
+
+static int ipu3_vidioc_g_meta_fmt(struct file *file, void *fh,
+				  struct v4l2_format *f)
+{
+	struct imgu_video_device *node = file_to_intel_ipu3_node(file);
+
+	if (f->type != node->vbq.type)
+		return -EINVAL;
+
+	f->fmt = node->vdev_fmt.fmt;
+
+	return 0;
+}
+
+static int ipu3_vidioc_enum_input(struct file *file, void *fh,
+				  struct v4l2_input *input)
+{
+	if (input->index > 0)
+		return -EINVAL;
+	strscpy(input->name, "camera", sizeof(input->name));
+	input->type = V4L2_INPUT_TYPE_CAMERA;
+
+	return 0;
+}
+
+static int ipu3_vidioc_g_input(struct file *file, void *fh, unsigned int *input)
+{
+	*input = 0;
+
+	return 0;
+}
+
+static int ipu3_vidioc_s_input(struct file *file, void *fh, unsigned int input)
+{
+	return input == 0 ? 0 : -EINVAL;
+}
+
+static int ipu3_vidioc_enum_output(struct file *file, void *fh,
+				   struct v4l2_output *output)
+{
+	if (output->index > 0)
+		return -EINVAL;
+	strscpy(output->name, "camera", sizeof(output->name));
+	output->type = V4L2_INPUT_TYPE_CAMERA;
+
+	return 0;
+}
+
+static int ipu3_vidioc_g_output(struct file *file, void *fh,
+				unsigned int *output)
+{
+	*output = 0;
+
+	return 0;
+}
+
+static int ipu3_vidioc_s_output(struct file *file, void *fh,
+				unsigned int output)
+{
+	return output == 0 ? 0 : -EINVAL;
+}
+
+/******************** function pointers ********************/
+
+static struct v4l2_subdev_internal_ops ipu3_subdev_internal_ops = {
+	.open = ipu3_subdev_open,
+};
+
+static const struct v4l2_subdev_video_ops ipu3_subdev_video_ops = {
+	.s_stream = ipu3_subdev_s_stream,
+};
+
+static const struct v4l2_subdev_pad_ops ipu3_subdev_pad_ops = {
+	.link_validate = v4l2_subdev_link_validate_default,
+	.get_fmt = ipu3_subdev_get_fmt,
+	.set_fmt = ipu3_subdev_set_fmt,
+	.get_selection = ipu3_subdev_get_selection,
+	.set_selection = ipu3_subdev_set_selection,
+};
+
+static const struct v4l2_subdev_ops ipu3_subdev_ops = {
+	.video = &ipu3_subdev_video_ops,
+	.pad = &ipu3_subdev_pad_ops,
+};
+
+static const struct media_entity_operations ipu3_media_ops = {
+	.link_setup = ipu3_link_setup,
+	.link_validate = v4l2_subdev_link_validate,
+};
+
+/****************** vb2_ops of the Q ********************/
+
+static const struct vb2_ops ipu3_vb2_ops = {
+	.buf_init = ipu3_vb2_buf_init,
+	.buf_cleanup = ipu3_vb2_buf_cleanup,
+	.buf_queue = ipu3_vb2_buf_queue,
+	.queue_setup = ipu3_vb2_queue_setup,
+	.start_streaming = ipu3_vb2_start_streaming,
+	.stop_streaming = ipu3_vb2_stop_streaming,
+	.wait_prepare = vb2_ops_wait_prepare,
+	.wait_finish = vb2_ops_wait_finish,
+};
+
+/****************** v4l2_file_operations *****************/
+
+static const struct v4l2_file_operations ipu3_v4l2_fops = {
+	.unlocked_ioctl = video_ioctl2,
+	.open = v4l2_fh_open,
+	.release = vb2_fop_release,
+	.poll = vb2_fop_poll,
+	.mmap = vb2_fop_mmap,
+};
+
+/******************** v4l2_ioctl_ops ********************/
+
+static const struct v4l2_ioctl_ops ipu3_v4l2_ioctl_ops = {
+	.vidioc_querycap = ipu3_vidioc_querycap,
+
+	.vidioc_enum_fmt_vid_cap_mplane = vidioc_enum_fmt_vid_cap,
+	.vidioc_g_fmt_vid_cap_mplane = ipu3_vidioc_g_fmt,
+	.vidioc_s_fmt_vid_cap_mplane = ipu3_vidioc_s_fmt,
+	.vidioc_try_fmt_vid_cap_mplane = ipu3_vidioc_try_fmt,
+
+	.vidioc_enum_fmt_vid_out_mplane = vidioc_enum_fmt_vid_out,
+	.vidioc_g_fmt_vid_out_mplane = ipu3_vidioc_g_fmt,
+	.vidioc_s_fmt_vid_out_mplane = ipu3_vidioc_s_fmt,
+	.vidioc_try_fmt_vid_out_mplane = ipu3_vidioc_try_fmt,
+
+	.vidioc_enum_output = ipu3_vidioc_enum_output,
+	.vidioc_g_output = ipu3_vidioc_g_output,
+	.vidioc_s_output = ipu3_vidioc_s_output,
+
+	.vidioc_enum_input = ipu3_vidioc_enum_input,
+	.vidioc_g_input = ipu3_vidioc_g_input,
+	.vidioc_s_input = ipu3_vidioc_s_input,
+
+	/* buffer queue management */
+	.vidioc_reqbufs = vb2_ioctl_reqbufs,
+	.vidioc_create_bufs = vb2_ioctl_create_bufs,
+	.vidioc_prepare_buf = vb2_ioctl_prepare_buf,
+	.vidioc_querybuf = vb2_ioctl_querybuf,
+	.vidioc_qbuf = vb2_ioctl_qbuf,
+	.vidioc_dqbuf = vb2_ioctl_dqbuf,
+	.vidioc_streamon = vb2_ioctl_streamon,
+	.vidioc_streamoff = vb2_ioctl_streamoff,
+	.vidioc_expbuf = vb2_ioctl_expbuf,
+};
+
+static const struct v4l2_ioctl_ops ipu3_v4l2_meta_ioctl_ops = {
+	.vidioc_querycap = ipu3_vidioc_querycap,
+
+	/* meta capture */
+	.vidioc_enum_fmt_meta_cap = ipu3_meta_enum_format,
+	.vidioc_g_fmt_meta_cap = ipu3_vidioc_g_meta_fmt,
+	.vidioc_s_fmt_meta_cap = ipu3_vidioc_g_meta_fmt,
+	.vidioc_try_fmt_meta_cap = ipu3_vidioc_g_meta_fmt,
+
+	/* meta output */
+	.vidioc_enum_fmt_meta_out = ipu3_meta_enum_format,
+	.vidioc_g_fmt_meta_out = ipu3_vidioc_g_meta_fmt,
+	.vidioc_s_fmt_meta_out = ipu3_vidioc_g_meta_fmt,
+	.vidioc_try_fmt_meta_out = ipu3_vidioc_g_meta_fmt,
+
+	.vidioc_reqbufs = vb2_ioctl_reqbufs,
+	.vidioc_create_bufs = vb2_ioctl_create_bufs,
+	.vidioc_prepare_buf = vb2_ioctl_prepare_buf,
+	.vidioc_querybuf = vb2_ioctl_querybuf,
+	.vidioc_qbuf = vb2_ioctl_qbuf,
+	.vidioc_dqbuf = vb2_ioctl_dqbuf,
+	.vidioc_streamon = vb2_ioctl_streamon,
+	.vidioc_streamoff = vb2_ioctl_streamoff,
+	.vidioc_expbuf = vb2_ioctl_expbuf,
+};
+
+/******************** Framework registration ********************/
+
+/* helper function to config node's video properties */
+static void ipu3_node_to_v4l2(u32 node, struct video_device *vdev,
+			      struct v4l2_format *f)
+{
+	u32 cap;
+
+	/* Should not happen */
+	WARN_ON(node >= IMGU_NODE_NUM);
+
+	switch (node) {
+	case IMGU_NODE_IN:
+		cap = V4L2_CAP_VIDEO_OUTPUT_MPLANE;
+		f->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
+		vdev->ioctl_ops = &ipu3_v4l2_ioctl_ops;
+		break;
+	case IMGU_NODE_PARAMS:
+		cap = V4L2_CAP_META_OUTPUT;
+		f->type = V4L2_BUF_TYPE_META_OUTPUT;
+		f->fmt.meta.dataformat = V4L2_META_FMT_IPU3_PARAMS;
+		vdev->ioctl_ops = &ipu3_v4l2_meta_ioctl_ops;
+		ipu3_css_meta_fmt_set(&f->fmt.meta);
+		break;
+	case IMGU_NODE_STAT_3A:
+		cap = V4L2_CAP_META_CAPTURE;
+		f->type = V4L2_BUF_TYPE_META_CAPTURE;
+		f->fmt.meta.dataformat = V4L2_META_FMT_IPU3_STAT_3A;
+		vdev->ioctl_ops = &ipu3_v4l2_meta_ioctl_ops;
+		ipu3_css_meta_fmt_set(&f->fmt.meta);
+		break;
+	default:
+		cap = V4L2_CAP_VIDEO_CAPTURE_MPLANE;
+		f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
+		vdev->ioctl_ops = &ipu3_v4l2_ioctl_ops;
+	}
+
+	vdev->device_caps = V4L2_CAP_STREAMING | cap;
+}
+
+int imgu_v4l2_register(struct imgu_device *imgu)
+{
+	struct v4l2_mbus_framefmt def_bus_fmt = { 0 };
+	struct v4l2_pix_format_mplane def_pix_fmt = { 0 };
+
+	int i, r;
+
+	/* Initialize miscellaneous variables */
+	imgu->streaming = false;
+
+	/* Init media device */
+	media_device_pci_init(&imgu->media_dev, imgu->pci_dev, IMGU_NAME);
+
+	/* Set up v4l2 device */
+	imgu->v4l2_dev.mdev = &imgu->media_dev;
+	imgu->v4l2_dev.ctrl_handler = imgu->ctrl_handler;
+	r = v4l2_device_register(&imgu->pci_dev->dev, &imgu->v4l2_dev);
+	if (r) {
+		dev_err(&imgu->pci_dev->dev,
+			"failed to register V4L2 device (%d)\n", r);
+		goto fail_v4l2_dev;
+	}
+
+	/* Initialize subdev media entity */
+	r = media_entity_pads_init(&imgu->subdev.entity, IMGU_NODE_NUM,
+				   imgu->subdev_pads);
+	if (r) {
+		dev_err(&imgu->pci_dev->dev,
+			"failed initialize subdev media entity (%d)\n", r);
+		goto fail_subdev_pads;
+	}
+	imgu->subdev.entity.ops = &ipu3_media_ops;
+	for (i = 0; i < IMGU_NODE_NUM; i++) {
+		imgu->subdev_pads[i].flags = imgu->nodes[i].output ?
+			MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
+	}
+
+	/* Initialize subdev */
+	v4l2_subdev_init(&imgu->subdev, &ipu3_subdev_ops);
+	imgu->subdev.entity.function = MEDIA_ENT_F_PROC_VIDEO_STATISTICS;
+	imgu->subdev.internal_ops = &ipu3_subdev_internal_ops;
+	imgu->subdev.flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
+	strscpy(imgu->subdev.name, IMGU_NAME, sizeof(imgu->subdev.name));
+	v4l2_set_subdevdata(&imgu->subdev, imgu);
+	imgu->subdev.ctrl_handler = imgu->ctrl_handler;
+	r = v4l2_device_register_subdev(&imgu->v4l2_dev, &imgu->subdev);
+	if (r) {
+		dev_err(&imgu->pci_dev->dev,
+			"failed initialize subdev (%d)\n", r);
+		goto fail_subdev;
+	}
+	r = v4l2_device_register_subdev_nodes(&imgu->v4l2_dev);
+	if (r) {
+		dev_err(&imgu->pci_dev->dev,
+			"failed to register subdevs (%d)\n", r);
+		goto fail_subdevs;
+	}
+
+	/* Initialize formats to default values */
+	def_bus_fmt.width = 1920;
+	def_bus_fmt.height = 1080;
+	def_bus_fmt.code = MEDIA_BUS_FMT_FIXED;
+	def_bus_fmt.field = V4L2_FIELD_NONE;
+	def_bus_fmt.colorspace = V4L2_COLORSPACE_RAW;
+	def_bus_fmt.ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
+	def_bus_fmt.quantization = V4L2_QUANTIZATION_DEFAULT;
+	def_bus_fmt.xfer_func = V4L2_XFER_FUNC_DEFAULT;
+
+	def_pix_fmt.width = def_bus_fmt.width;
+	def_pix_fmt.height = def_bus_fmt.height;
+	def_pix_fmt.field = def_bus_fmt.field;
+	def_pix_fmt.num_planes = 1;
+	def_pix_fmt.plane_fmt[0].bytesperline = def_pix_fmt.width * 2;
+	def_pix_fmt.plane_fmt[0].sizeimage =
+		def_pix_fmt.height * def_pix_fmt.plane_fmt[0].bytesperline;
+	def_pix_fmt.flags = 0;
+	def_pix_fmt.colorspace = def_bus_fmt.colorspace;
+	def_pix_fmt.ycbcr_enc = def_bus_fmt.ycbcr_enc;
+	def_pix_fmt.quantization = def_bus_fmt.quantization;
+	def_pix_fmt.xfer_func = def_bus_fmt.xfer_func;
+
+	/* Create video nodes and links */
+	for (i = 0; i < IMGU_NODE_NUM; i++) {
+		struct imgu_video_device *node = &imgu->nodes[i];
+		struct video_device *vdev = &node->vdev;
+		struct vb2_queue *vbq = &node->vbq;
+		u32 flags;
+
+		/* Initialize miscellaneous variables */
+		mutex_init(&node->lock);
+		INIT_LIST_HEAD(&node->buffers);
+
+		/* Initialize formats to default values */
+		node->pad_fmt = def_bus_fmt;
+		ipu3_node_to_v4l2(i, vdev, &node->vdev_fmt);
+		if (node->vdev_fmt.type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE ||
+		    node->vdev_fmt.type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
+			def_pix_fmt.pixelformat = node->output ?
+						V4L2_PIX_FMT_IPU3_SGRBG10 :
+						V4L2_PIX_FMT_NV12;
+			node->vdev_fmt.fmt.pix_mp = def_pix_fmt;
+		}
+		/* Initialize media entities */
+		r = media_entity_pads_init(&vdev->entity, 1, &node->vdev_pad);
+		if (r) {
+			dev_err(&imgu->pci_dev->dev,
+				"failed initialize media entity (%d)\n", r);
+			goto fail_vdev_media_entity;
+		}
+		node->vdev_pad.flags = node->output ?
+			MEDIA_PAD_FL_SOURCE : MEDIA_PAD_FL_SINK;
+		vdev->entity.ops = NULL;
+
+		/* Initialize vbq */
+		vbq->type = node->vdev_fmt.type;
+		vbq->io_modes = VB2_USERPTR | VB2_MMAP | VB2_DMABUF;
+		vbq->ops = &ipu3_vb2_ops;
+		vbq->mem_ops = &vb2_dma_sg_memops;
+		if (imgu->buf_struct_size <= 0)
+			imgu->buf_struct_size = sizeof(struct ipu3_vb2_buffer);
+		vbq->buf_struct_size = imgu->buf_struct_size;
+		vbq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+		vbq->min_buffers_needed = 0;	/* Can streamon w/o buffers */
+		vbq->drv_priv = imgu;
+		vbq->lock = &node->lock;
+		r = vb2_queue_init(vbq);
+		if (r) {
+			dev_err(&imgu->pci_dev->dev,
+				"failed to initialize video queue (%d)\n", r);
+			goto fail_vdev;
+		}
+
+		/* Initialize vdev */
+		snprintf(vdev->name, sizeof(vdev->name), "%s %s",
+			 IMGU_NAME, node->name);
+		vdev->release = video_device_release_empty;
+		vdev->fops = &ipu3_v4l2_fops;
+		vdev->lock = &node->lock;
+		vdev->v4l2_dev = &imgu->v4l2_dev;
+		vdev->queue = &node->vbq;
+		vdev->vfl_dir = node->output ? VFL_DIR_TX : VFL_DIR_RX;
+		video_set_drvdata(vdev, imgu);
+		r = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
+		if (r) {
+			dev_err(&imgu->pci_dev->dev,
+				"failed to register video device (%d)\n", r);
+			goto fail_vdev;
+		}
+
+		/* Create link between video node and the subdev pad */
+		flags = 0;
+		if (node->enabled)
+			flags |= MEDIA_LNK_FL_ENABLED;
+		if (node->immutable)
+			flags |= MEDIA_LNK_FL_IMMUTABLE;
+		if (node->output) {
+			r = media_create_pad_link(&vdev->entity, 0,
+						  &imgu->subdev.entity,
+						 i, flags);
+		} else {
+			r = media_create_pad_link(&imgu->subdev.entity,
+						  i, &vdev->entity, 0, flags);
+		}
+		if (r)
+			goto fail_link;
+	}
+
+	r = media_device_register(&imgu->media_dev);
+	if (r) {
+		dev_err(&imgu->pci_dev->dev,
+			"failed to register media device (%d)\n", r);
+		i--;
+		goto fail_link;
+	}
+
+	return 0;
+
+	for (; i >= 0; i--) {
+fail_link:
+		video_unregister_device(&imgu->nodes[i].vdev);
+fail_vdev:
+		media_entity_cleanup(&imgu->nodes[i].vdev.entity);
+fail_vdev_media_entity:
+		mutex_destroy(&imgu->nodes[i].lock);
+	}
+fail_subdevs:
+	v4l2_device_unregister_subdev(&imgu->subdev);
+fail_subdev:
+	media_entity_cleanup(&imgu->subdev.entity);
+fail_subdev_pads:
+	v4l2_device_unregister(&imgu->v4l2_dev);
+fail_v4l2_dev:
+	media_device_cleanup(&imgu->media_dev);
+
+	return r;
+}
+
+int imgu_v4l2_unregister(struct imgu_device *imgu)
+{
+	unsigned int i;
+
+	media_device_unregister(&imgu->media_dev);
+	media_device_cleanup(&imgu->media_dev);
+
+	for (i = 0; i < IMGU_NODE_NUM; i++) {
+		video_unregister_device(&imgu->nodes[i].vdev);
+		media_entity_cleanup(&imgu->nodes[i].vdev.entity);
+		mutex_destroy(&imgu->nodes[i].lock);
+	}
+
+	v4l2_device_unregister_subdev(&imgu->subdev);
+	media_entity_cleanup(&imgu->subdev.entity);
+	v4l2_device_unregister(&imgu->v4l2_dev);
+
+	return 0;
+}
+
+void imgu_v4l2_buffer_done(struct vb2_buffer *vb,
+			   enum vb2_buffer_state state)
+{
+	struct ipu3_vb2_buffer *b =
+		container_of(vb, struct ipu3_vb2_buffer, vbb.vb2_buf);
+
+	list_del(&b->list);
+	vb2_buffer_done(&b->vbb.vb2_buf, state);
+}